Pump



April 10, 1928.

W. l. DERRICK PUMP Filed April 25, 1923 2 Sheets-Sheet 1 W.- l. DERRICK April 10,1928. 6 1,665,687

PUMP

Filed April 25, 1925 2 Sheets-Sheet 2 llllI fi' I I I 6 6 I I a 7 n' v..

| H u 1 I j Patented Apr. 10, 1928.

UNITED STATES PATENT OFFICE.

WILLIAM I. DERRICK, F DAVENPORT, IOWA, ASSIGNOR T0 WESTCO-GHIBPEWA. rm COMPANY, OF DAVENPORT, IOWA, A COBPOBATION OF DELAWARE.

PUMP.

Application filed April 25,

This invention relates to rotary pumps andmore particularly to the class of pumps having a rotor mounted in a casing.

An object of the invention is to provide 6 a pump with a rotor which engages liquid in an annular passage or passages and delivers 1t to a suitable discharge with a greater efliciency than pumps of this class have heretofore had.

Another object of the invention is to provide an improved construction of pumps of this type in which a relatively larger quan: tity of water delivered may be increased or relatively higher pressures .may be attained, or both.

These and other objects will be apparent from the drawings and specification.

In the drawings,

Figure 1 is a side elevation partly in sectlon of the pump assembled.

Fig. 2 is a side elevation of the rotor. Fig. 3 is a transverse section of the rotor. Fig. 4 is a side elevation of the pump casing with the rotor removed.

Figs. 5 and 6 are sections of the pump taken on the lines 5-5 and 6-6 respectively of Fig. 4;.

Fig. 7 is a view of the edge of part of the rotor.

The pump has a suitable base 1 and comprises a casing 2 formed with member-s3, 4 which are held together by suitable bolts. The members 3, 4 of the casing have laterally extending tubular bosses 5, 6 respectively to receive the shaft 10. These bosses receive suitable packing material, thus forming a stufiing box closed by the nuts 13, 14 which surround the shaft 10 and are threaded into the bosses.

The bracket arms 7, 8 extend laterally from the sides of the casing and have apertures therein in axial alinement With the bosses or hubs 5, 6. These apertures are designed to receive suitable bearing members in which the shaft 10 may be rotated by any desired power means such as a motor (not shown). Secured to the shaft 10 in any suitable manner for rotation therewith is a rotor 11, which will be more fully described in the specification hereafter.

The member 3 has an outer peripheral wall at an angle to the body portion, and a peripheral flange 22 in a plane paral- 1923. Serial N0. 634,499.

lel to the body portion. The 'member 4 has a flange 23 offset from the body portion, a face of which bears against the face of the opposed flange 22 of the member 3. The annular flange 22 and 23' are recessed at 27 and are provided with a packin 24 disposed in said recesses to-prevent lea age between the flanges. The recesses 27 are preferably of larger cross-sectional area than the packing so that the packing can be compressed and be formed to make a. tight joint and yet will not prevent the faces of the flanges 22 and 23 from being in contact throughout substantially their entire area for a purpose to be more fully set forth hereinafter. The shoulder 26 formed around the body portion of the member 4 by the offset flange 23 is received inside and engages the outer wall 25 of the member 3. With this construction is formed .a substantially liquid tight, disc-like opening in which the rotor 11 is mounted to be rotated by the shaft 10.

The opposed body portions of the members 3, 4 have annular passages 17, 18 formed therein leading from a common supply opening 15, connected to a suitable source of liquid, to a discharge opening 16 connected to a service line or other desirable line. The passages 17, 18 preferably are tapered, being progressively smaller in cross sectional area from the supply to the'discharge opening. Near the periphery of the rotor and opposed to the passages 17 18 are formed a multiplicity of blades 30 to engage the liquid in the passages 17, 18. These blades may extend in the passages 17, 18 but preferably they are formed in the rotor and their outer edges do not extend beyond the faces of the rotor. If desired, the blades may be formed by milling out pockets 32, leaving the ribs or blades 30 upstanding. The pockets 32 are of suflicient depth so that movement of the blades relative to the passages 17 18 will eflectively move and carry along the liquid therein. An efficient cross sectional shape of the passages 17, 18 is shown in the drawings, but this may be modified to vary the quantity of liquid delivered or the pressures developed during the operation of the pump to procure I pumps suited to meet various conditions. The pockets 32 do not extend the extreme edge of the rotor 11 but termmate a suflicient distance radially inwardly therefrom to leave continuous annular surfaces 33 which rotate adjacent the body portions of the members 3, 4 and resist escape of liquid from the passages17, 18, the rotor casing members thus being in suflicient proximity to prevent any substantial quantity of liquid moving between them.

The rotor 11 has a substantially liquidtight engagement'with the body portions of the members 3, 4 of the casing to prevent leaka e of any substantial amount of liquid radia 1y inwardly from the passages 17 18. Between the supply opening 15 and the discharge opening 16 is a deflecting member or cut-off 36 adapted to closely engage the face of the buckets on each side "of the rotor to prevent liquid from passing from the discharge ends of the passages 17, 18 into the supply or suction ends of these channels except such liquid as may be carried past the deflecting members in the buckets of the rotor.

eral face ofthe rotor and rotor buckets with- The deflector closely engages the' latin the raceways and spans a suflicient num ber of the pockets or blades to substantially prevent the unrestricted flow of liquid between the face of the rotor and the deflecting means and to maintain relatively large pressure differentials between the outlet and the inlet ends of the raceways. It will be understood, of course, that the liquid retained in the pockets of the rotor as they pass the liquid deflecting means will be carried from the outlet end of the passage to the inlet end thereof without substantial loss in pressure which would result if liquid were permitted to flow between the blades and the deflecting means. By this means a relatively high pressure differential is maintained during operation of the pump between the inlet and the outlet ends of the passages.

The provision of raceways on opposite sides of the rotor substantially relieves the rotor from unbalanced lateral thrustwhich in pum s of this character operating to produce re atively high pressures is of considerablc degree. In hi h pressure pumps having a raceway in only one side thereof, the rotor may even be deflected laterally by these pressures which would destroy in part Y the close fit between the rotor and casing and limit the usefulness of the pump.

In the wall of the member 3 of the easing I preferably form an additional passage 19 from the supply opening to the discharge opening, which is preferably tapered, rowing smaller from the suction to the disc arge openin I also provide blades 34 similar to blac es and pockets between them in the edge of the rotor disc to engage the liquid in the passage 19. These pockets are also formed relatively shorter in length than the width of thea'otor disc, thus leaving two continuous. annular faces 37 to engage the wall 25 and resist the flow of liquid out of the passage. The provision of the channel 19 enables me to obtainrelatively greater pressures and relatively larger volumes of liquid.

As it is essential that with my pump the casing and rotor be accurately positioned with respect to each other, I have designed a c0'n-' struction with which it is comparatively easy to insure such positioning. The member 3 of the casing with its flange 22 may be accurately made and the member 4 with its flange 23 may also be accurately made. By insuring the contact of the flanges 22 and 23, notwithstanding the packing between them, the casing members may be easily assembled to properly position them with respect'to the rotor.

In the-"normal operation of my pump, upon rotation of the rotor the blades 30 act upon the liquid in the passages 17, 18, and the blades'34 act upon the liquid in the passage 19, moving it'forward through the passages which are progressively decreasing in press sectional area from the inlet to the outet. tion of the area of the passages and dimensions of the rotor blades, the water is delivered to the discharge side of the pump at a relatively high pressure or in a relatively large vo ume and this with greater efliciency than heretofore has been attainable.-

It will be noticed that while the rotor and casing members are so positioned .as to prevent any substantial quantity of water passing between them, any liquid that may pass the sealing surfaces 33, 37 will be received in the channel 19 and be delivered into the discharge opening.

It will also be seen that the rotor may be relatively thin, thus reducing the weight of the metal to be moved and requiring less power to move it.

As the rotor and easing walls are positioned closely together throughout a substantial area between the hub and annular passages 17 18 the escape of waterradially inwardly from the raceways is very greatly resisted and in fact is substantially prevented, and such liquid as may come between Depending upon the relative propor.

the rotor and casing during the operation of be forced outward y can be received in channel 19 and carried in it to the discharge duct. It will also be noticed that the blades may be formed integrally with or attached to the rotor and in their longitudinal dimension may be straight 'or curved, it bcin desirable, however, to have the blades isposed substantially at right angles to the liquid in the channel.

Furthermore, it is to be understood that the particular forms of apparatus shown and described, and the particular procedure set forth, are presented for purposes of explanation and illustration and that various modifications of said apparatus and procedure can be made without departing from my invention as defined in the appended claims.

What I claim is:

1. A pump comprising a casing, a shaft mounted therein, a rotor secured to the shaft, a plurality of annular passages in the casing adjacent the periphery of the rotor, said passages having common peripheral supply and discharge ducts, and blades on the rotor for engaging liquid in said passages, said rotor and casing having a substantially liquid-tight running fit between said passages and liquid deflecting means having a close running fit with said blades and extending over a plurality of successive blades for deflecting liquid from said annular passages to said discharge duct and for maintaining relatively great pressure differential between the outlet and the inlet ends of the passages.

2. A pump comprising a casing, a shaft mounted therein and carrying a rotor, a plurality of radially closed annular passages in the casing adjacent the periphery of the rotor, said passages being connected to supply and discharge ducts and being of less cross sectional area progressively from the supply duct to the discharge duct, and blades on the rotor to engage liquid in said passages.

3. A pump comprising a, casing, a rotatable shaft mounted therein and having. a rotor secured thereto, an annular passage in the casing adjacent the periphery of said rotor and terminating in supply and discharge ducts, said passage having portions of different cross sectional areas between the supply and discharge ducts, blades on the rotor to engage liquid in said passage and a liquid deflecting member having a close running fit with a plurality of said blades for deflecting liquid from the annular passage to the discharge duct.

4. The combination with a pump body and a cover forming a casing of a shaft mounted therein and carrying a rotor, the casing walls and rotor having a substantially liquid-tight engagement, a plurality of passages in the casing adjacent the edge of the rotor, said rotor having blades thereon to engage liquid in said passages, supply and discharge ducts for supplying liquid to and'receiving liquid from said passages, and liquid deflecting means closely cooperating with said blades for deflecting liquid from said passages to said discharge ducts, said deflecting means being adapted to maintain substantial pressure differential between the outlet. and inlet ends of the passage during operation. 7

- 5. A pump comprising a casing, a shaft mounted therein and carrying a rotor, a plurality of annular passages in the side walls of the casing and opposed to the faces of the rotor, blades carried by the rotor to engage liquid in said passages, the rotor and easing having a substantially liquidtight fit radially inwardly of said passages, supply and discharge ducts cooperating with the ends of said passages and deflecting means in said passages for deflecting liquid from each passage to a discharge duct and for maintaining substantial pressure differential between the inlet and outlet ends of the passages during operation.

6. A pump comprising a casing, a shaft mounted therein and carrying a rotor, a plurality of annular passages in the side walls of the casing and opposed to the faces of the rotor, blades carried by the rotor to engage liquid in said passages, the rotor and easing having a substantially liquid-tight fit radially inwardly of said passages, and supply and discharge ducts cooperating with the ends of said passages, said passages having portions of less cross sectional area between the supply and discharge ducts.

7. A pump comprising a casing, a shaft mounted therein, a rotor secured to the shaft, opposed annular passages formed in the side walls of the casing and adjacent the peripheral edge of the rotor, blades carried by the rotor to engage liquid in said passages, said rotor and easing having a substantially liquid-tight engagement between said passages, a liquid deflector and stop at the discharge ends of said passages, and supply and discharge ducts for supplying liquid to and receiving liquid from said passages.

8. A pump comprising a casing and a rotatable disc therein, said casing having a plurality of independent annular passages formed therein adjacent the periphery of the rotor, independent annular series of radially disposed blades formed on said disc to engage liquid in said passages, said disc and caslng having a substantially tight fit Whereby movement of liquid radially inwardly is resisted, and supply and discharge ductscooperating with said passages.

9. A pump comprising a casing and a movable rotor therein, said casing having a plurality of opposed annular passages adjacent the periphery of the rotor, the rotor and casingdiaving engaging portions at each side of said passages to form liquid seals, a passage in the casing opposite the peripheral edge of said rotor, radially disposed blades on the rotor to move adjacent said passages, supply and discharge ducts for said annular passages, and a. stop and liquid deflector of greater circumferential extent than the separation of said blades between the discharge duct and the passages.

10. A pump comprising a casing and a rotor mounted for movement therein,said casing having a plurality of opposed annular passages, blades carried by the rotor to move adjacent said passages, supply and discharge ducts for said passages, said passages each having at least one portion of less cross sectional area between said supply and discharge ducts, said rotor and easing having a sufiiciently close fit to substantially prevent movement of liquid radially inwardly.

11. A pump comprising a casing, a shaft mounted for rotation therein andcarrying a rotor, opposed annular passages formed in the walls of said casing and provided with supply and discharge ducts, said rotor being provided with blades to enga e the liquid in said passages, said passages being formed progressively smaller in cross sectional area from their supply ends to their discharge ends, said rotor and easing being provided with means to substantially prevent movement of liquid radially inwardly, and a cutoff to prevent liquid passing from the discharge ends of said passages into the supply ends.

12. A pump comprising a casing, a shaft mounted for rotation therein and carrying a rotor, independent annular passages formed in said casing and provided with supply and discharge ducts, said rotor being provided with blades to engage liquid in said passages, said blades being disposed in a plurality of annular series, one series on the edge and the other series being dis osed in the faces of the rotor and adjacent t e edge, said rotor and easing being provided with cooperating means to substantially prevent movement of the liquid radially inward and to prevent liquidfrom passing from the discharge ends of said passages into the supply ends thereof.

13. In a rotary pump, a cylindrical casing opposed annular passageways near the inner eriphery of the casing, a rotor fittin snugy within the casing and having poc ets on opposite sides aligning with said passageways, and inlet and outlet ports communicatmg with said passageways.

14. A pump comprising a casing having two parallel circular fluid raceways and a common inlet and a common outlet for said -raceways, and a rotor having an annular series of buckets in each raceway.

15. A pump comprising a rotor having an annular marginal. series of blades in each lateral face and a casing forming therewith an annular channel, said casing oneach side of each of said channels forming axsubstantially water-tight joint with the face of said rotor on each side of said blades to form a pair of closed fluid raceways.

16. A pump comprising a rotor having an annular marginal series of blades in each lateral face thereof, a shaft for said rotor and a casing having bearings for said shaft and comprising a section facing each side of said rotor and respectively having an annular channel therein opposite the series of blades, the said casing sections each forming a substantially water-tight joint with the corresponding face of the rotor on each side of the corresponding series of blades to form a pair of closed fluid raceways, said casing having a fluid-inlet and outlet.

17 A pump comprising a rotor having an annular groove in each lateral face thereof, a plurality of blades in each of said grooves forming a series of buckets, the walls of each groove closing the spaces between the blades at the sides thereof, and a casing having a channel facing each of said grooves, the casing making substantially water-tight joints with each lateral surface of the rotor on the opposite sides of the groove to for a pair of closed fluid raceways.

18. A pump comprising a rotor having an annular groove in each lateral face thereof, a plurality of blades in each groove forming a series of buckets, the ends of the blades being, substantially flush with the corresponding surface of the rotor at the sides of the groove, and a casing having a channel facing each side of said rotor and making substantially water-tight joints with the surface of the rotor on opposite sides of the groove to form a pair of closed fluid raceways.

19. A pump comprising a rotor having in each lateral face an annular groove and a plurality of blades in each of said grooves, the walls of each groove closing the spaces between the blades at the sides thereof, and a casing having an annular channel therein facing each of said grooves and blades and making a substantially water-tight joint with each lateral face of the rotor on opposite sides of the groove to form a pair of sub- 'stantially closed fluid raceways. r

20. A pump comprising a casing, a rotatable disc in said casing having annularly arranged blades disposed adjacent'but inwardly from the peripheral edge of the disc and forming buckets open to each lateral face of the rotor whereby a continuous annular face lies immediately adjacent said P8 ripheral edge, said casing and disc making a substantially water-tight fit along said face on each side of said rotor, and a groove in each side wall of said casing forming a pair of fluid passages therein on opposite sides of the rotor and opposite the blades, and fluid deflecting means closely .fitting a plurality of consecutive blades at the discharge end of the passages whereby submama-z stantial loss of pressure at the discharge ends of the passages is prevented.

21. A pump comprising a casing, a rotatable disc in said casing, said casing having an annular passage formed therein opposlte each lateral face of the disc and adjacent its margin, an annular series of blades on said disc spaced from its periphery to engage liquid in each of said passages, said disc and easing having a substantially tight fit on the less maximum diameter than the disc and adjacent its margin, 2. separate annular series of bladeson a lateral face. of said disc for engaging liquid in each of said assages, pockets on the disc between the bla es closed from the riphery of the disc, said disc and easing ma li in a substantially tight fit on the inner side 0 each of the series of blades whereby movement of liquid radially inwardly from the passages is resisted, and supply and discharge ducts cooperating with said passages.

23. A pump comprising a casing, a rotatable disc in said casing, said casing having an annular passage therein opposite each lateral face of the disc and adjacent its margin, an annular series of blades on each lateral face of said disc to engage. liquid in said passages,'pockets on the disc between the blades closed from the periphery of the disc, said disc and casing makin a substantially tight fit on the inner side 0 each series of blades whereby movement of liquid radiall inwardly is resisted, there belng also a su stantially tight fit between the casing and rotor outsideeeach series of blades, a liquid deflecting stop in close working engagement at all times during operation with at least one of said blades, and supply and discharge ducts cooperating with said passages.

24. A pump comprising a casing, a rotatable disc in said casin said casing having an annular passage t erein opposite each lateral face of the disc and adjacent its margin, a se arate annular series of blades on each lateral ace of said disc to engage liquid in said passages, pockets on the disc between the blades, said disc and easing making a substantially tight fit on the inner side of the series of blades whereby movement of liquid radially inwardly is resisted, there being also a substantially tight fit between the casing and rotor outside each series of blades,- and supply and discharge ducts 00- operating with said passages.

25. A rotary pump comprising a casing having a plurality of fluid raceways, a ro- 7 tor in said casing having a series of blades for operating upon fluid travelling throu h each raceway, said casing having anin et and an outlet duct each communicating directly with .each of said raceways, and a liquid deflecting stop making a close working fit with said blades and adapted to maintain a substantial pressure differential at the outlet end of each raceway.

26. A single-stage rotary pump comprising a casing having a plurality of fluid raceways, and a rotor in said casing having a series of pockets adjacent its mar-' gin for operating upon fluid travelling through each raceway, said casing having, an inlet and an outlet duct each communicating directly with each of said raceways and fluid deflecting means in the casing adjacent the outlet of each racewa closely engaging a plurality of consecutive lades of the rotor for maintaining relatively large pressure differentials between the outlet and inlet ends of the raceways during operation of the pump.

27. In a rotary pump, a substantially cylindrical casing, opposed annular passageways near the inner periphery ofthe casing, a rotor within the casing having pockets on opposite sides aligning with said passageways, inletand outlet ports each commumo eating directly with each of said passageways, and liquid stop and deflecting means closely fitting the openings of said pockets for maintaining substantial pressures at the outlet end of the raceways during operation of the pump.

28. A pump comprising a casing, a' shaft mounted therein, a rotor secured to the shaft,

. a plurality of annular passages in the casing adjacent the periphery of the rotor, said casno ing having a substantially peripheral supply and a substantially peripheral discharge-duct each communicating directly with each of said passages, blades on the rotor for engaging liquid in said passages, and li uid de-. fleeting means making a close wor ing fit with the blades on the rotor and of greater circumferential, extent than the distance between successive blades for maintaining substantial pressures at the outlet ends of the passages.

29. A pump comprising a casing, a shaft mounted therein, a rotor secured to the shaft, a plurality of annular passages in the casing adjacent the periphery of the rotor, said passages being disposed opposite one another and the rotor being positioned therebetween, said casing having a supply and a discharge duct each communicating directly with each of said passages, blades on the rotor for engaging and propelling liquid through said passages, and liquid'deflecting and pressure retaining means adjacent the discharge end of said passages'making a close'working fit with the blades of the rotor.

30. A rotary pump comprising a casing having at least two annular fluid raceways, a rotor in the casing having a plurality of series of blades one of which series cooperates with each raceway for operating on fluid travelling therethrough, and liquid deflecting means in the casing adjacent the outlet of each raceway forclosel engaging a plurality of consecutive bla es of the rotor for maintaining relatively large pressure differentials between the outlet and inlet ends of the raceways.

31. A rotor for a pump comprising a metallic disc having a multiplicity of pockets formed in the disc and opening into opposite lateral faces of saididisc, said ockets being disposed adjacent to but radia ly inwardly from the peripheral edge of the disc whereby a continuous annular face lies immediately adjacent said peripheral edgeof each side of said disc, a casing for the rotor, radially closed annular race-ways formed on each side of the disc by close working fits between said casing and disc, supply and discharge ducts communicatin with said raceways, and means adjacent t e discharge end of the raceways and of greater circumferential extent than the width of one of said tor, liquid propelling blades on the rotoradapted to engage and propel liquid along said raceways, and a stop at one end of said raceways arranged to closely fit a plurality of the blades of the rotor on each side thereof to prevent substantial flow of liquid between the stop and the edges of the blades at the discharge end of said raceways for maintaining relatively high pressure differentials between the supply and discharge ends of said raceways whereby the lateral thrusts produced by liquid under pressure in said raceways are opposing and self comnsating and the rotor is substantially re- 'eved from unbalanced axial thrusts.

33. A rotary pump comprising a casing, a rotor mounted therein having annular portions on each side adjacent the periphery making a close running fit with the casing to define therewith a fluid raceway on each side of the rotor adjacent its peripheiy,-li uid propelling blades on the rotor a apte to engage and propel liquid along said raceways, a discharge duct, and means in the casing closely fitting a the rotor blades for deflecting quid from said raceways into the discharge duct and for preventing substantial flow of liquid along said rotor between the blades and said deflecting means whereby unbalanced axial pressures on said rotor are avoided and whereby relatively high pressure differentials are maintained between the inlet and discharge ends of said raceways.

34. A rotary pump comprising a casing, a rotatable disc cooperating therewith to form a plurality of radially closed annular passages remote from the axis of the disc,

'a multiplicity of liquid engaging pockets formed in said disc to engage liquid in said passages and propel the same therealong, said disc and easing having a. substantially liquid tight working fit on the radially inner side of each passage whereby movement of liquid radially inwardly from said passage is substantially prevented, and liquid deflecting means of greater circumferential extent than the width of one pocket closely fitting said pockets for maintaining a relatively high pressure differential between the inlet and the outlet ends of the passages during operation of the pump.

35. A rotary pump comprising a casing, a rotatable discin said casing, said disc and easing cooperating to form a radially closed annular passage having a close working fit on the inner side of said passage whereby substantial flow of liquid radially inward from the passage is prevented, a multiplicity lurality of 1 of liquid engaging and propelling pockets formed in the disc for propelling liquid along said annular passage, and liquid deflecting means circumferentially extending over more than one pocket and closely fitting the face of the pockets of the disc adjacent the discharge end of the passage for preventing substantial flow of liquid between sides of the pockets and the casing adjacent the outlet end of said passage, sai passage being of relatively great length with respect to its radial width and being of materially less cross sectional area adjacent the discharge end than adjacent the other end thereof.

36. A rotary pump comprising a casing, a rotatable disc in said casing, said disc and casing cooperating to form a radially closed annular passage having a close working fit on the inner side of said passage whereby substantial flow of liquid radially inward from the passage is prevented, a multiplicity of liquid en aging and propelling pockets formed in t e disc for propelling liquid along said annular passage, and liquiddeflecting means closely fitting the face of the pockets of the. disc adjacent the discharge end of the passage for preventing substantial flow of liquid between the sides of the pockets and the casing adjacent the outlet end of said passage, sa-id passage being of tween said blades, said blades being disposed 10 relatively eat len h with respect to its inwardly from the peripheral edge of the radial wi th and ing of progressively disc and remote from its axis whereby a con- I smaller effective cross sectional area from tinuous annular face lies immediately adjal theinlet end to the outlet end thereof. cent said peripheral edge.

37. A rotor for a pump comprising a me- ,In testimony whereof, I hereunto aflix my 15 tallic disc havin an'annular series of rasignature. dially disposed b ades on each side thereof,

pockets formed in each side of the disc be- WILLIAM I. DERRICK. 

